arduous /ärˈdū-əs/

1. Steep, difficult to climb
2. Difficult to accomplish
3. Laborious

ardˈuously adverb

• hyraxes
• hyson
• hysons
• hyson-skin
• hyssop
• hyssops
• hyster-
• hysteranthous
• hysterectomies
• hysterectomise
• hysterectomised
• hysterectomises
• hysterectomising
• hysterectomize
• hysterectomized
• hysterectomizes
• hysterectomizing
• hysterectomy
• hystereses
• hysteresial
• hysteresis
• hysteretic
• hysteria
• hysterias
• hysteric